<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		.red {	               /*类选择器是可以重复多次使用的*/
			color: red;
		}
		#pink {
			color: pink;
		}
	</style>
</head>
<body>
	<div class="red">张三</div>
	<div id="pink">张三丰</div>
	<div class="red">张三疯子</div>
</body>
</html>